Pronunciation: [ˈə͡ʊpənsˌa͡ɪtli] (IPA)
Correct spelling for the English word "opensightly" is [ˈə͡ʊpənsˌa͡ɪtli], [ˈəʊpənsˌaɪtli], [ˈəʊ_p_ə_n_s_ˌaɪ_t_l_i] (IPA phonetic alphabet).